It is not unfamiliar to squeeze oil with peanuts, but in oil extraction in the mud, have you heard of it? On January 25th, the reporter learned at CPEC's exhibition of industrialized application of oily sludge pyrolysis technology that there is a customizable "oil press" with oil extraction in mud. With magical functions, the recovered petroleum can be used as raw materials for refineries to continue deep processing and become high value-added oil products.

The traditional methods of domestic oil refinery companies dealing with oily sludge are costly and have poor results. The first experimental application of oily sludge pyrolysis technology in the sludge processing field of domestic refinery companies has opened up new ideas for oil sludge treatment in refinery companies.

Problem-oriented change to survive

“The existing domestic refinery companies have corresponding treatment and disposal measures for oily sludge, but there are still some technical difficulties in fully realizing resource utilization.” January 31, CPECC Huadong Environmental Geotechnical Engineering Branch Deputy Chief Engineer Xiao Yong told reporters: “This technology is a special treatment device that separates the oil in the oily sludge in the form of pyrolysis, which allows oil to be recycled again, non-condensable gas as a supplementary fuel, and residue resources. Use."

CPECC East China Environmental Geotechnical Branch has long been engaged in environmental assessment and safety assessment business, seized the opportunity to “go out to attract intelligence”, explore new fields of sludge processing, introduce advanced foreign technologies, enhance innovation through trials and R&D, and achieve transformation and upgrading , to enhance the competitiveness of the enterprise market.

At present, domestic and foreign oil-containing sludge treatment technologies mainly include landfill, hot wash, incineration, bioremediation and physical chemistry. However, in actual industrial applications, these technologies may occupy large amounts of land or consume large amounts of fuel, or High operating costs, low efficiency, or secondary pollution, to a certain extent, limit the large-scale application.

Although foreign advanced oil-containing sludge treatment technologies have been successfully applied, there are no reports on the reliability and long-term stable operation of domestic refinery companies and oil fields, which has become a heart issue for environmentalists.

Change birth road, change and seek development. CPECC East China Environmental Geotechnical Co., Ltd. jointly set up a research and development team in conjunction with Uni-Uni Environment to solve the problem of oil sludge treatment in petrochemical companies. In the second half of 2016, the R&D team moved to various parts of the country, from Karamay to Dagang, Tianjin, to carry out component investigations, chemical analysis, and centrifugal tests on various oily sludges. After a thousand technical combinations and process designs, a crack was made. Another problem.

Thought development and gradual progress

The domestic environmental protection scientists and technicians have solved a series of difficult problems. All they have left are hard bones. It is easy to say and difficult to do. The R&D team spends a lot of time on system design, non-standard equipment design and site optimization.

During investigations and tests, it was learned that a new type of pyrolysis technology has been widely used abroad in oil fields and refineries. However, the oily sludge produced by foreign refineries is different from the domestic one. How to combine the foreign pyrolysis technology with the actual conditions of the domestic refineries and independently develop a set of pyrolysis and supporting technologies for grounding gas?

Innovation breaks. In the case of intrinsic safety, the research team determined the relevant technical parameters of pyrolysis and supporting equipment. In September 2017, pilot tests were conducted at Dagang Petrochemical to carry out on-site demonstration of new processes, new equipment and new materials, and promote scientific research. The results are transformed into on-site production.

When the HAZOP safety analysis was conducted on the test device, it was found that foreign open-end sludge feeding systems had major hidden troubles. The R&D team modified the test plan to make the loading system completely closed and meet the refinery safety requirements. After the equipment arrived, the R&D team worked hard for more than 20 days to complete non-standard equipment manufacturing and skid-mounted equipment in the prefabricated factory.

During the on-site commissioning of the test device, foreign technicians were not familiar with Chinese refined oil sludge with a liquid content of up to 90%. After few days of exploration and no progress, they had already decided to give up. Under the leadership of the team leader, the R&D team repeatedly explored the debugging method and adopted a reasonable parameter ratio to break through the technical problems of pyrolysis for high-liquidity sludge.

When the device is running, new problems arise again. Domestic refinery oils have high colloidal content, high viscosity, and easy clogging of the slagging system. The R&D team uses the operating temperature of the regulating equipment and adopts cascade cooling to achieve a smooth slag discharge. In late December 2017, the temperature in Tianjin's Dagang reached minus ten degrees Celsius, and the sludge tanks were frozen. The on-site operation personnel took the cold and used manual heating with steam heating to ensure the normal operation of the test device.

After field tests and tests, the pyrolysis technology can fully meet the requirements of refining oil sludge treatment. It can treat oily sludge with a liquid content higher than 90%, and the reduction is more than 80%. The treatment cost is far lower than the external disposal costs. “At present, the main treatment technology of oily sludge is abroad. By introducing pyrolysis core equipment and independently researching and developing peripheral equipment, it can realize the industrialization of the project in a short time, and can save a lot of costs.” The person in charge of the project introduced.

Independent innovation breaks the bottleneck

The R&D team created a major core supporting technology tool and effectively cracked down on production technology problems. This device does not condense back to the pyrolysis equipment as a supplemental fuel for its own use, which can reduce the fuel consumption of the pyrolysis equipment. The residue of pyrolysis is stabilized and solidified by a chelating process, which can be used for landfill treatment or comprehensive utilization of building materials.

The large-scale application of the sludge pyrolysis treatment technology can eliminate the safety risk of the refinery oil sludge in the plant area and possible environmental impact. The current sludge transportation costs are high and the economic burden on the company is heavy. Pyrolysis treatment technology can not only save the costs of external committees' disposal, but also recover large amounts of petroleum resources, bringing about value-added benefits for refineries.

"The main battlefield facing business development is regarded as the main direction of technological innovation. High quality development requires us to place industrial innovation in an important position," said Wang Taoyi, deputy general manager of CPECC. Through independent innovation and the introduction of digestion, absorption and re-innovation, the company has made breakthroughs in the technical problems that have hampered the development of enterprises and common technical issues in the industry. CPECC has made major breakthroughs in various fields.

In 2017, CPECC invested 120 million yuan in scientific research and conducted more than 100 scientific research projects, including 3 national major projects and 4 group companies; 62 authorized patents, 26 invention patents, and 28 technical secrets; It is recognized that the Group has independently innovated 7 products and promoted and applied more than 30 scientific and technological achievements.

Oily sludge pyrolysis technology process

The oily sludge is stored in the sludge tank and the sludge is raised to the pretreatment system by the feeding system. After pretreatment, the material is sent to the pyrolysis system. After the pyrolysis, the material is discharged from the system after cooling the screw. The pyrolyzed process gas is washed and condensed and separated. After the non-condensable gas is treated by the exhaust gas treatment system, it is returned to the pyrolysis equipment as an auxiliary fuel. After the condensed liquid is separated by oil and water, the waste oil is recycled and the waste water enters the water treatment system.

Expert point of view

Solid waste treatment pyrolysis technology has great potential

From marine disposal, landfill to natural drying, dewatering bio-compost, to dry incineration, pyrolysis and gasification, China's solid waste disposal technology has undergone a process of evolution from low to high levels. As China's Yangtze River Delta, Pearl River Delta and Beijing-Tianjin-Hebei regions are densely populated with limited land resources, solid waste incineration has become a mainstream technology and is a natural choice for the development process. It is imperative that R&D economic, environmental, and safety treatment methods and devices fully recover the oil in the sludge and that the residual oil content in the treated soil meets the new national standards.

Pyrolysis technology is one of the cutting-edge technologies for polymer mass energy research in the world. This technology uses continuous processes and industrialized production methods to transform sludge into high-value energy products that are easy to store, transport, energy density, and easy to use, such as oil, gas, and solid products. Compared with conventional oxygen-consuming incineration technology, it has the advantages of emission of smoke and air pollutants, and effective reduction of greenhouse gas emissions.

Solid waste such as oil sludge in the oil industry is not the same as municipal solid waste sludge. The oil content is not only high, but also poor in dehydration. At present, it is most feasible to use pyrolysis technology to treat oily sludge. Pyrolysis is an emerging technology, involving materials science, thermal engineering, automation control, etc. China's research started relatively late.

For the first time, Dagang Petrochemical conducted the pyrolysis test on the “three muds” and bottom sludge produced in the refining industry. Based on the introduction of the core technology of US oil sludge pyrolysis, we independently developed supporting technologies and equipment, and all the test equipment used skids. Assembly design. After long-term test and testing, the pyrolysis technology can fully meet the processing requirements of the refined oil sludge. The treated residue meets the national standards and can recover the petroleum hydrocarbons in the sludge with high safety and reliability.

Pyrolysis technology, as a major equipment technology developed in China, has been widely used in various fields and has become a heavy equipment for solid waste disposal. In addition to pyrolysis of sludge, pyrolysis treatment is increasingly used in waste treatment, biomass, and hazardous heat treatment. For example, the pyrolysis gasification is extended to the treatment of soil remediation, hazardous waste oil sludge, chromium-containing sludge, food waste, leather waste, etc., and it is used for bio-char preparation and energy of rice husks, corn stalks and other biomass. Clean use, and recycling of activated carbon and other fields.

Pyrolysis technology will have bright prospects in various fields of solid waste treatment. Whoever has mastered pyrolysis technology will have the right to speak and speak. The shift from non-renewable carbon-based resources to renewable bio-based resources has become an international trend. The U.S. Department of Energy uses pyrolysis as the key technology for the third generation of biomass energy utilization. Japan, Australia, and Germany are also conducting corresponding research. In Germany, a waste pyrolysis experimental project with a scale of 100 tons was implemented.

At the same time, pyrolysis technology will also become a trend in zero emissions. China uses pyrolysis technology for the treatment of biofermented slag, which has broad prospects in hazardous waste treatment. As a system solution for townships, pyrolysis technology will also play a major role in the treatment of agricultural waste.

As an effective solid waste treatment technology, it is hoped that pyrolysis of this clean incineration technology can receive more attention and recognition. We must advance the progress of pyrolysis technology along the correct technological route. (Hu Xinling, Vice President of the China Circular Economy Association)

Pressure Transmitter

pressure transmitter is a device that converts pressure into a pneumatic signal or an electric signal for control and remote transmission. Pressure Sensor can convert the physical pressure parameters such as gas and liquid felt by the load cell sensor into a standard electrical signal (such as 4~20mADC, etc.), to supply secondary instruments such as indicating alarms, recorders, regulators, etc. for measurement and indication and process regulation.

Pressure transmitters are used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other industries.

There are two types of pressure transmitters: electric and pneumatic. The uniform output signal of the electric type is a direct current signal such as 0-10mA, 4-20mA or 1-5V. The unified output signal of the pneumatic type is the gas pressure of 20-100Pa.

Pressure transmitters can be divided into force (torque) balance type, capacitive type, inductive type, strain type and frequency type according to different conversion principles.

Our advantageous products are mainly compact pressure transmitters, pressure transmitters with display, differential pressure transmitters, wind pressure transmitters, etc.

The main advantage

1. The pressure transmitter has the characteristics of reliable operation and stable performance

2. Dedicated V/I integrated circuit, less peripheral components, high reliability, simple and easy maintenance, small size, light weight, and extremely convenient installation and debugging;

3. Aluminum alloy die-casting shell, three-terminal isolation, electrostatic spray protection layer, durable;

4. 4-20mA DC two-wire signal transmission, strong anti-interference ability and long transmission distance;

5. LED, LCD, and pointer three kinds of indicator heads, the on-site reading is very convenient. Can be used to measure viscous, crystalline and corrosive media;

6. High accuracy and high stability. In addition to the imported original sensor that has been corrected by laser, the comprehensive temperature drift and nonlinearity of the whole machine within the operating temperature range are finely compensated.

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